Protoceratops AMNH 6414 skull - Public domain natural history illustration

Title: Central Asiatic Expeditions of the American Museum of Natural History, under the leadership of Roy Chapman Andrews : preliminary contributions in geology, palaeontology, and zoology
Identifier: centralasiaticex01cent (find matches)
Year: the leadership of Roy Chapman Andrews : under the leadership of Roy Chapman Andrews : (und0s)
Authors: Central Asiatic Expeditions (1921-1930); Andrews, Roy Chapman, 1884-1960; Matthew, William Diller, 1871-1930
Subjects: Central Asiatic Expeditions (1921-1930); Scientific expeditions; Natural history; Scientific expeditions; Natural history
Publisher: (New York : American Museum of Natural History
Contributing Library: American Museum of Natural History Library
Digitizing Sponsor: Biodiversity Heritage Library



Text Appearing Before Image:
1925) A PRIMITIVE CERATOPSIAN DINOSAUR of the tibia as compared with the femur, (4) the lack of coalescence of the two halves of the secondary skull roof above the frontals. Of the typical Ceratopsidae, the genus Ceratops (Chasmosaurus) represents a stage in which the frill has become produced backwardly,
Text Appearing After Image:
A.M.6414 Fig. 2. Protoceratops andrewsi. Side view of supposed old male skull. A. M. No. 6414. One-fourth natural size. Although considerably distorted by the lens, this view shows well the great depth of the beak, which recalls that of Psiflacosau'rus, the shortness and depth of the lower jaw, the height and prominence of the sagittal crest of the parietal, the relatively small size of the orbit as compared with that of the younger skull, etc. The great development of the occipital frill and of the jugal is obviously not pri- marily for the protection of the neck but for the support of the robust muscles necessary to operate the great beak and grinding apparatus. The cheek teeth are not shown in this specimen. One-fourth natural size. elongating the parietal fontanelles so that their longitudinal much exceeds their transverse diameter. The nasal and supraorbital horns are still small. Torosaurus, with its highly fenestrated frill, would be the logical outcome of this line of development.